A copyeditor and a proofreader are both essential professionals in the publishing process, but their responsibilities, timing, and level of intervention are different. In a publishing house, the copyeditor mainly works on the manuscript to improve its accuracy, clarity, consistency, readability, and conformity with the publisher’s editorial style. The proofreader, on the other hand, works primarily on the typeset or final version of the publication to identify errors that have appeared or remained after editing and typesetting. Thus, copyediting is an editorial activity, while proofreading is largely a quality-control activity performed during the pre-press and final production stages. The copyeditor is usually involved much earlier in the publishing workflow. Once a manuscript has been accepted by the publisher, it is sent for editorial preparation and copyediting. The copyeditor reads the manuscript carefully, often sentence by sentence and paragraph by paragraph. The main objective is to ensure that the text communicates the author’s ideas clearly and accurately. The copyeditor corrects grammatical, spelling, punctuation, syntax, and usage errors. At the same time, the copyeditor checks whether the writing is consistent in tone, terminology, capitalization, spelling conventions, abbreviations, and other stylistic matters. A major responsibility of the copyeditor is maintaining consistency throughout a manuscript. For example, if a book uses British spelling, the copyeditor ensures that forms such as “colour,” “organisation,” and “centre” are used consistently instead of mixing them with American forms. Similarly, the copyeditor checks the consistent treatment of headings, subheadings, quotations, numbers, dates, references, footnotes, tables, and captions. The publisher may have a house style, and the copyeditor ensures that the manuscript follows that style. Copyediting also involves checking the internal accuracy and logic of a manuscript. The copyeditor may notice contradictory statements, missing information, unclear references, incorrect cross-references, inconsistent names, dates, or figures. In academic and technical publishing, the copyeditor may check citations and bibliographical references for consistency and completeness. However, the copyeditor does not normally alter the author’s ideas or argument unnecessarily. The role is to improve the presentation of the author’s work while preserving its meaning and voice. Another important function of the copyeditor is communication with the author or commissioning editor. When a sentence is ambiguous, a fact appears doubtful, or an important point needs clarification, the copyeditor may raise a query. Such queries help the author resolve problems before the manuscript moves into production. The copyeditor therefore acts as an important link between the author, editor, and production team. The proofreader performs a different function. Proofreading normally takes place after the manuscript has been edited and typeset. The edited text is converted into pages according to the design and layout of the